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Politics, Special Report, Americas
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Designated by the World Health Organization (WHO) as a global "variant of concern" (VOC), delta was blamed for the deadly wave of infections that decimated India, a country that on June 9, reached a world record daily high of more than 6,000 deaths in one day. Dr. Paul Goepfert, a professor of medicine at the University of Alabama at Birmingham and an expert in vaccine design. Coronavirus disease, or COVID-19, is caused by a single species of virus known as SARS-CoV-2. When the original virus, also called "normal," or "wild type," replicates, or copies itself, the sequence of its molecules, called nucleotides, sometimes changes from the original virus. These changes are called mutations. Most of the time, these variations don't work or make the virus weaker. But sometimes they can make the virus stronger, more contagious or more resistant to the immune system. These variations of the wild-type virus - or variants - catch the eye of health officials in the global SARS-CoV-2 laboratory network at the WHO's Virus Evolution Working Group.




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